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<p>also serve to conduct heat from the combustion process out from the exhaust valve and into the cylinder head where it may be taken up by the cooling system. <a href="page.php?w=Bronze">Bronze</a> is commonly used, as are various <a href="page.php?w=iron">iron</a> alloys; a balance between stiffness and wear on the valve is essential to achieve a useful service life. <a href="page.php?w=Powder_metallurgy">Powder metallurgy</a> materials are also commonly used in the manufacture of valve guides, which have the advantages of flexible material composition</p><p>
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